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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b642c873da7d5e3dce626ebdb97e545aaaefde36947eb078837ba23d955fbaf3' 
  AND token = 'BGoDQgsw8lj2VpRTkSdZHDh6PoN3nV1gpFxtzeajQ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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