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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e77ba6ce6f8bf3ff15b62a7a23249cf6bc74600d90f42ce8a2ef125e0c4d450' 
  AND token = 'zs3oQnbPsaFXw4hYBDISRXbLDE9m+clEAHewvD1ig7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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