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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16e1b2ef7c3e9a626a2462a8b473bf12cc20919c90c8846a587b12d3b7544ae9' 
  AND token = 'aXcZQArZ7q7DHde6MUwEmeYVNOg1zwdEHl0BHd3nYEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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