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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71c2b2d9d33774a2929aefd7e23862a93bb2fc9d85e52c24affd99ee3cde7c8c' 
  AND token = 'YTHx7O7KS4avJE/wO2BhabRBsbhQscyNuYeeCpme+Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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