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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '846806abefc486d011c63ae67b8e50caf771ba47521a55bb252d1c4d1a02230c' 
  AND token = 'ag5p5IWUtsmwJPntxi1rQwJ4uPaR7WHXSTgc+zDXBtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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