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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '892f1d6e2ade4bbcf326499802ec953f0d84261ffa624466057b3e3c031327ee' 
  AND token = 'KrDLc+tA4jBcyTCaLnxET/eSUXLyeM/4JQgHQAjJUd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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