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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cf8cc035bb91ff1ae8272d41fdf88ec3eeeb3308e780d783d3e0a1e0a172633' 
  AND token = 'PeQQZ03N6yRhqdrDnT8ZGFybuJMKj4nA6SXjaqKKFNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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