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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c9489f6f0f062ee4a2b7949f2177eb6a5f9fb8c4f3edbf71c6bd15b4b822791' 
  AND token = '6E14j5ET8AL+fGV7Y2AX6aeJJ1D11vyoEyg9045ekHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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