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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ca20d222a3fe4e7a9ddffa61e317ca68335a427e14b67aeedd648dc046e10c' 
  AND token = '5eve6kT2ekqRtIkPVDNB/GJVEzRHtzjmY0xEI/d1uTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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