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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85f35d894e49800d8913af0a7c7c8ba5ed73cc8e06df3cf01a88c3cdbbc1e866' 
  AND token = '6fQfICI047yEJzbB30Ak6uF8n3bD35KRkf7uxMTrAzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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