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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '057b8365b83e514cfd6e657f44373aaac6cfbfe8a162cce3359fa9949fd6b401' 
  AND token = 'NhLGYN3NEjNcqkqrz6HhLV5H28aYSlLUm3RSr97AKYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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