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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75469edeb76b02c72f7c25e2200bcb4017c1b08b12fac31241d68ec5eea9bac7' 
  AND token = 'ZB96e0TX2J/O1UgD8vxRMXGYcaLBX/VmGCnw295MPO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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