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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51c79d3950e5b037bd3d70bf21812cef875e6edad5efa3fda386edbc1bd8bca0' 
  AND token = 'zkTIgxapd38KHXKV7RBTwAzIttl+jfkmOhVvJtr2x1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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