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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91070846ad7c6055691fedb9c1fe5229c355b996fb79c1687354e0d0e58f5d2d' 
  AND token = 'PzhB55P1dW8+dDxD51/nt/9//MWOCiIy0DhAVft0/8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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