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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f898cfd0c9e3f29b266bbdd569b80eeda8dcec49304c1f2065e72bed8c6ee7e1' 
  AND token = 'o+VE1fp71jBIismkxGh0ZskfOQyNgCsVRdGKkVpQKgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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