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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a265ddac3847c8c828dbc326457b4581cb2fabe38820590bd6d67e483c3be04e' 
  AND token = 'zdeO5W6jm6ygZks4GUVApExg4uj8N91UuOZj+Lozres=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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