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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '685c325f09ebdddc8cfcfce6065f2eab4a8a119afdc8a5e6df22ea6f7023687c' 
  AND token = 'PtG9whkQDADitNpRRRe+H8pAWLG3n2a5GdAmWZKDYgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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