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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc8bc7db9d41c799679e0bd04a2fa50a0e07ab547ee03683311ae199b551e0cc' 
  AND token = 'LLO5vSXP1sgijDPtVYtSYw3unC6KWoGZj/aXbQWLtjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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