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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8aa48a2c8e07e5b4c92b70560eaa1f257641eb23f57cd87eb7c068c1e0ad32a' 
  AND token = 'gk8o4k+g45o8MdngCJcerOr9UzMzDwRMGFdP8N4x8bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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