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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8affcf7980ca0d4d8ea5f9c5a5191a9cfb18430c96a725d6466fdb335082b0dc' 
  AND token = 'FIlDa1braU0Kf4jVSWB+5JKBoT13ZpQ0SYvl8iBrkXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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