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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0db9e6c13e5bef7b3d1963adbf3b759f966255ec3cf012384d11cce5a9e22b5' 
  AND token = '7bzztQqBQG/t54LQR2D6suQU9P26dNOPsdaSTiSh+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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