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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdebaa6660390fa6e53d19cbe60198c58aa57801e15ed525ff7ae39672f62987' 
  AND token = 'PX+dUXETH2Y3IkAoWXGA39taaxscBcWPxECuzN/eCIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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