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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bf4554b33cacf43fab6fd429c0e0e44700f950f6f47981992897f0c1aecbfd4' 
  AND token = '0HI21awZdGb0ZGctczNPPbQzIIJJDNYW/+2ngEeiEco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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