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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad44ed30a2756c0eea0c9d214f2fd127d1c11c6fa04a8b61fd7a304b1c4da993' 
  AND token = '8uAbEI1IlijNXyqbGff+Mu8fqdjlivIzO8uBRvjDAHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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