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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6cfe26f443dde5547d41a65234884b4b114e7436160da88381a1bb56d9bf3aa' 
  AND token = 'eOiD4FiZo9D/oIRtxzaVKNE5fFps6sCanvxAJIV9AcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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