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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3db116abbc97bfac370e9b9fbe46a245a489bc2c52ac992b77e20c986febae' 
  AND token = 'mF6UVnSuHPZ0ujQKKOzY/0j2y01Jtfh2tHa6q9NE8Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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