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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53d25a1571a501c40d4bbe475665d7ee4eecac9fe186ac74c7b0f41f7f60e896' 
  AND token = 'rPaeJ9ZCgQoJg0JxBrJQrw9u9vjjx55AWixmLAGdAL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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