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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cc4291e40da7baec739cdd26a65049a6c37b1258da30948e27151d3fb337bb2' 
  AND token = 'Jbm5y2msZwI0tEwqbqWy579lHPJ8QZHlFIKeIKele0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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