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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '126a53e8a99d52eb81f87a6bf80c0b43274c78bfbca67d8a4af69370394e8f77' 
  AND token = 'Ong6MXpGLyPiyur7NwJD3syN+4I38k6epEk54AMN0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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