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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d0636e15a134b3402b084f64edf688f2b0450cf3f96108c41b7f287f3faf6d2' 
  AND token = 'mcTxx2lTlCNDG/ITP8RR3KROlahj3UJrkqUdW59aZ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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