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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e58617624be342384a10a85523a85700e8625c1f45ce0ec28957d7a9cf24123a' 
  AND token = 'qNz5uNz3r0SDCpKMYvm7oPGavAhZTS0zXbU8uD4Mr98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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