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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd64779ae0a266e8a0dca923c156f9b61a2fd103ebd1312ced43980d68cd3da0f' 
  AND token = 'qFtdGyUuqJu3cDYfFnGhujXTo2oy5VhTIwENezjvT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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