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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba5d74cf5056b32d30f41622e41483bfdec4c4cd3a15cb023c18a0ea4bca2bff' 
  AND token = '/ZemWx4JAcMCCHstOq7Yfzw7xyHZopmkrfrwGT1WAFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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