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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad7af894fe8f96776592aecd608d2fef2319a12015bbe4363a1d72bc3f60af9' 
  AND token = 'a1Aw/qjuAjoPPAVV1tMJ6yXSaXF1Dzzb65c0nNtLbSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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