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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e21ec42205a4d125c9bb1c948e5cc813d5688be8a66cd8c83b1a0b84d5aa117e' 
  AND token = 'OZxBky1wqLkB+kpCUkraBJvungfpM8rfstUaRFMBhgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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