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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b1300b58d61cf555e8195f8bcab88f9248009e6526e77d7ea87ff59ad894877' 
  AND token = 'RXMW9ct4GV87F8fo5ISBiRtN/AbPv67dVsBplBhbJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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