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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e7bb03e191394568feff0838655520aaddd8b0f90f33c5ab617f6b8fdcba78f' 
  AND token = '7911SISvWzGoCW6L2FkBS6XDqYtIEPCXfjnxoL+s04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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