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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ede1db58fc8d3b93ce7cd12d36f64fd5bbacc36f9a8a472df6f1fe2e8c3631' 
  AND token = 'APIyQ8+u0d5ymo19z6Ntn+5QKbouq1FM9d9dIkPfnUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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