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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc35354e849296272ce9eebbafccf4d0b1ad4ca234d929831e8c90a839d4f2d7' 
  AND token = 'RSqxIK+VXXxexR6SpYMnN3PLmTEdASILFAlxIn5AHcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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