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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65aba0b695e2367f1c160d32898eb23ba0e256f49ea1ca735971f648d4b2466b' 
  AND token = '6Jem5QFQRl0Mf0LIyTfr6PqYpFxXfZtQ6ey4+g3t1AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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