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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '559b5b9990e057078ee0b95beecb2528cb8d4a1a4eca2346a2be889b77616d85' 
  AND token = 'pEVHJRJEoyptHnmCe3f6XM7YvISfiaoot+98SghD4xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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