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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8365e53f32420fc12a771fb2706b9a7ddc62290ad2980239360a4b836b42c75a' 
  AND token = 'gx/X37RFCORSI0UJKG+9t6P3BuwNS6Uo91BQ61bg04E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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