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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47be8b73e8bfc3c8a1ce6253596c0acc556b9ea66e2bbfb25424d29f62540c36' 
  AND token = 'fyeQdV6lCrn/QG/vatmAk5yz8yh3fMArQKiLp/c8btQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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