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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5c86c3d4b86559a1c738768aff88ed990629a704a2f95a8479d3c8f7541e8d8' 
  AND token = '00uXMHqftbQADaXo4OWQ0jcsr2uX7eCx+j6XNzlyubg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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