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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaab989158787103f09b3615a30a2130099dacee12721efbb4c681a347a1e4f0' 
  AND token = 'KuSRcOKEF966xeXq2lCTfoT9yLtGOIxIU5Gel5slxYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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