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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36e06d6b205cd708c13c6ae00471758dafec95fc1310f3f16f6a007e5591c76c' 
  AND token = 'R5qSMszRMd5+rr9f5NQUQVcYc7GDwABbcH3H1DaJhGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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