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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5526b67acc9cc067f34bbafcc1494e71943dda168bea58562d6bab1cfa67fc9' 
  AND token = 'ZNlEdILHzavaMnQi4HnpiBt3qfX+ex4mZAPTTciNiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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