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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e4f5d65c8aa7407ef429b795c08a0ab5cce0d982295b9399bd3d9705afdbc4b' 
  AND token = '4TEsJAxjcNFnOp9kEvLLyesuprwwZym0qdd7+bJRwyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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