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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '974260d242ef5729e84c3bf6b694d3bb8b3817ed4cd27f8f950f0885afd7598e' 
  AND token = 'HQxixb8faeeBidTTfT1tFbruW2PmMKJGaSgevx3dv2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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