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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b146178100110e2c983b3345256cda3cd671472364d3a8335de3be37291d7a46' 
  AND token = 'WSHZwBrDuV5d+8KfB6IqIm5TBseBqAa+xZj2bboQXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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