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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b39d6b769b4eddb5e7aaaa0df2e52d8b2f7d9c6d80957eb8067b47b1df7683' 
  AND token = 'nIEVfLE/NGyu4hakF5+VBzkPAL6gq4PeBcPGPccicss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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