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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce02919fded2eed931fefa93abcfbc0b81ec25724c3c2ac278851ab95856944a' 
  AND token = '60aKHQ/gky+GVOxG4Jec3Rty4uE18rHaBxoWJAaGlyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}