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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70642f974a860e61124528915433819bf4dbd47ebe62aeda069dc834ad8bee72' 
  AND token = 'Azff+3MAnq4XRpwBdXtxv7zYcK5YsHZ674QMcDA3N20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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