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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7fc0309401cddcebad9b0c2e1efcc5e6c761ab96d43301c01974c3c682c76e1' 
  AND token = 'cFh48P5YSq2Tf7y4qIDTK/KLJqyBS2vf/Gj7NQ8U0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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