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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d5749d6a0934f548194fe17e7087744be7eec580e8e644cebd6ccdf1d040b7' 
  AND token = 'aj3upvubuCgcXT7DxTdPpMDQCqyCC6v+2xeM0yk2GLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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